The weekly sales (in dollars) for a particular brand of chocolate bar for a chain of grocery stores located in Sydney, Australia, follows.

Week	Sale ($)
1	100
2	125
3	321
4	430
5	400

a.Use a three-week moving average to develop a forecast for week 6.

b.Use exponential smoothing with a smoothing constant of =0.4 to develop a forecast for week 6.

c.Which of the two methods do you prefer and why?